How to parse through an NSMutable Array and add up the values

Question

Im having problems trying to add (sum) up all the values in a NSMutable Array: The ProfileItems contains data from a Core Data Entity, and is populated with the correct data. I'm just having problems parsing through the NSMutableArray and adding up the profileItems.songLength data.

Thanks in advance

   ProfileItems *profileItems = [profileItemsNSMArray objectAtIndex:indexPath.row];

    //Renumber the rows
    int numberOfRows = [profileItemsNSMArray count];
    NSLog(@"numberofRows: %d", numberOfRows);

    for (int i = 0; i < numberOfRows; i++) 
    {
        int sumOfSongs = sumOfSongs + [[profileItems.songLength] objectAtIndex:i];

        NSLog(@"length: %@",sumOfSongs);
    }

Bill Burgess · Accepted Answer · 2012-02-27 20:27:02Z

4

Try fast enumeration, it will work much faster and requires much less code.

int sumOfSongs = 0;

for (ProfileItems *item in profileItemsNSMArray) {
   sumOfSongs = sumOfSongs + [item.songlength intValue]; // use intValue to force type to int
}

edited Feb 27, 2012 at 20:27

answered Feb 27, 2012 at 20:13

Bill Burgess

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2 Comments

Paul S. Over a year ago

Awesome. I just had to touch up the code, but works perfectly. The only thing missing was the '*" in front of the item. for (ProfileItems *item in profileItemsNSMArray) {

Bill Burgess Over a year ago

Perfect. I updated my code in case anyone else comes across this answer.

tierfour · Accepted Answer · 2012-02-27 19:49:11Z

0

Try casting the objects in the NSMutableArray:

ProfileItems *profileItems = (ProfileItems*)[profileItemsNSMArray objectAtIndex:indexPath.row];

int numberOfRows = [profileItemsNSMArray count];

for (int i = 0; i < numberOfRows; i++) 
{
    int sumOfSongs += [[profileItems.songLength] objectAtIndex:i];

    NSLog(@"length: %@",sumOfSongs);
}

answered Feb 27, 2012 at 19:49

tierfour

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Comments

BenMorel · Accepted Answer · 2014-06-16 22:15:47Z

0

use intValue function on NSMutableArray object and use %d for printing integer.

ProfileItems *profileItems = [profileItemsNSMArray objectAtIndex:indexPath.row];

    //Renumber the rows
    int numberOfRows = [profileItemsNSMArray count];
    NSLog(@"numberofRows: %d", numberOfRows);

    for (int i = 0; i < numberOfRows; i++) 
    {
        int sumOfSongs = sumOfSongs + [[[profileItems.songLength] objectAtIndex:i]intValue]; // use intValue

        NSLog(@"length: %d",sumOfSongs); //use %d for printing integer value
    }

edited Jun 16, 2014 at 22:15

BenMorel

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answered Feb 27, 2012 at 19:48

Parag Bafna

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